Within Teamwork Projects, each projects plan comes with an allocated amount of storage which is broken down here per plan.
Upgrading file storage is only available on the Pro plan which already includes 100GB of storage.
You can upgrade this by a further 500GB if you have already paid for an annual subscription. The cost for this additional 500GB is $588 USD.
If you are on the pro plan and would like to take advantage of this upgrade please contact our sales team.
For more information, see: Per user pricing - Updating user amounts